بسم الله الرحمن الرحيم
"Something good we want to say can be taken badly because of our choice of words or the way we came across. Always choose the best words and ways." - Mufti Ismail Menk
The same thing should be implemented in Dakwah. When we want to give advise, we must rectify our language. The word "An-Nasohah" (advise) is literally means "filter" or "refine". That's why we need to do dakwah bil hikmah.
What does Al-Hikmah means? It means the right word for the right person at the right condition, time and place.
Practice this Du'a from Prophet Musa: "
رَبِّ اشْرَحْ لِي صَدْرِي
"O my Lord! Open for me my chest (grant me self-confidence, contentment and boldness.)
وَيَسِّرْ لِي أَمْرِي
And ease my task for me,
وَاحْلُلْ عُقْدَةً مِّن لِّسَانِي
And make loose the knot (the defect) from my tounge (i.e. remove the incorrectness from my speech),
So that they might fully understand my speech,"
[Surah Taha, 20: 25-28]